package com.itheima;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.function.Consumer;

public class HashSetDemo {
    public static void main(String[] args) {
        ArrayList<String> list = new ArrayList<>();
        list.add("张三");
        list.add("张三");
        list.add("张三");
        list.add("张三");
        System.out.println(list);

        ArrayList<String> newList = new ArrayList<>((new HashSet<String>(list)));
        System.out.println(newList);
        //1.创建HashSet对象
            HashSet<String> hashSet = new HashSet<>();
        //2.保存数据
        hashSet.add("张三");
        hashSet.add("李四");
        hashSet.add("王五");
        hashSet.add("赵六");
        hashSet.add("钱七");
        System.out.println(hashSet);
        //3.取数据（迭代器）
        Iterator<String> iterator = hashSet.iterator();
        while(iterator.hasNext()){
            String next = iterator.next();
            System.out.println(next);
        }
//        for (int i = 0; i < hashSet.size(); i++){
//
//        }//用不了
        //4.取数据（增强for循环）
        for (String name : hashSet){
            System.out.println("name="+name);
        }
        int[] arr = new int[]{1,2,3,4,5};
        for (int i : arr){
            System.out.println(i);
        }
        //5.取数据（Lambda—）
        hashSet.forEach(new Consumer<String>() {
            @Override
            public void accept(String s) {
                System.out.println(s);
            }
        });
        hashSet.forEach(s-> System.out.println(s));
        hashSet.forEach(System.out::println);//Lambda表达式替换为方法引用

        Student student = new Student("张三", 18);
        System.out.println(student);
    }
}
